side (fig. 85 B). I cannot give any details about the contents of the carpogonium, 
as on staining with hæmatoxyline it was in a great part very dark and intrans- 
parent. In the specimens collected in August and September numerous carpogonia 
with short trichogynes were found; other carpogonia had long trichogynes making 
their way outwards through the corlex, and tips of trichogynes protruding through 
the surface of the frond were also met with, but I have not yet seen spermatia 
fixed to them, and it remains thus to state whether fertilization takes place normally 
or the cystocarp may develop parthenogenetically, as in Platoma Bairdi. The car- 
Fig. 87. 
Furcellaria fastigiata. Sections of frond with young cystocarps. c, carpogonia; a, auxiliary cells; g, gominoblasts. 
September. A 180:1: B 19:1. 
pogonium shown in fig. 85 D seems to agree with the latter assumption, as an out- 
growth is given off from the base of the carpogonium, while the trichogyne is very 
short and unfertilized. 
The auxiliary cells (a in the figs.) arise, as stated by Scamirz (Engler u. Prantl, 
p. 526), from single cells in the inner cortex which seem to be at first but little 
different from the vegetative cells. They fuse with the long sporogenous filaments 
produced by the carpogonia and growing widely between the inner cortical cells 
and the medullary filaments. The fusion takes place at the inner end of the cell. 
After the fusion the auxiliary cell soon begins to produce gonimoblast cells laterally 
_ and at the inner side, and thus young cystocarps may occur already in August (fig. 86). 
The auxiliary cell after fertilization contains a number of nuclei, four or more, some 
of which certainly derive from the original nucleus of the cell, while the others 
are sporogenous (fig. 86 A, 87). The cell increases in volume and takes a more ir- 
regular outline. Fusions between neighbouring cortical cells seem to occur (fig. 87). 
D. K. D. Vidensk. Selsk. Skr., 7. Række, naturvidensk, og mathem, Afd. VII. 2. 22 
